This release updates firefox to 45.3.0esr and contains the improvements that went into Tor Browser 6.0.3. Additionally, Tor is updated to 0.2.8.5-rc, the default search engine has been switched to DuckDuckGo, resource URLs are blocked to avoid fingerprinting.

Note: Due to bug 19410, on OSX the incremental update will not be working for users who installed the previous version using the .dmg file. The internal updater should still work, though, doing a complete update.